Quartz

Quartz was a NWOBHM oddity, a band with a hit-or-miss catalog that
struggled for direction (bands who release live albums as their
second album are often misguided) throughout their career.
Amidst the chaos, however, was the outstanding Stand Up And Fight,
one of the heaviest and brightest moments of the early NWOBHM
period -- truly a classic.
Elsewhere there were flashes of brilliance (such as the Sabbathy
"Mainline Riders" from the first album, the Sabbath sound no doubt
due to none other than Tony Iommi producing the album), but
largely this was a band whose inconsistency did them in.
Their initial run lasted until around 1983, but many years later
(in 2011), a largely original lineup reformed, and a new album
was released in 2016.